React.createElement：类型无效 - 需要一个字符串（对于内置组件）或一个类/函数（对于复合组件）但未定义

Question

我刚刚开始学习如何使用 React Native 创建应用程序。 在了解了 Stack Navigator 之后，我尝试尝试一下，但我收到了这个错误。 警告：React.createElement：类型无效 - 需要一个字符串（对于内置组件）或一个类/函数（对于复合组件）但得到：%s.%s%s，未定义，您可能忘记导出您的来自定义它的文件中的组件，或者您可能混淆了默认导入和命名导入。

应用程序.js

import React from 'react';
import { Image, StyleSheet, Text, TouchableOpacity, View } from 'react-native';
import { NavigationNativeContainer } from '@react-navigation/native';
import {createStackNavigator}  from '@react-navigation/stack';


const Stack = createStackNavigator();
export default function App() {
    return( 
    <NavigationNativeContainer>
      <Stack.Navigator>
      <Stack.Screen name="Home" component={HomeScreen}/>
       </Stack.Navigator>
      </NavigationNativeContainer>
    );
}
const HomeScreen=(props)=> {
  return (
    <View style={{ flex: 1, alignItems: 'center', justifyContent: 'center' }}>
      <Text>Home Screen</Text>
    </View>
  );
}

Package.json

{
  "main": "node_modules/expo/AppEntry.js",
  "scripts": {
    "start": "expo start",
    "android": "expo start --android",
    "ios": "expo start --ios",
    "web": "expo start --web",
    "eject": "expo eject"
  },
  "dependencies": {
    "@react-native-community/masked-view": "^0.1.10",
    "@react-navigation/core": "^5.7.0",
    "@react-navigation/native": "^5.4.0",
    "@react-navigation/stack": "^5.3.7",
    "expo": "~37.0.3",
    "expo-font": "~8.1.0",
    "native-base": "^2.13.12",
    "react": "~16.9.0",
    "react-dom": "~16.9.0",
    "react-native": "https://github.com/expo/react-native/archive/sdk-37.0.1.tar.gz",
    "react-native-gesture-handler": "^1.6.1",
    "react-native-reanimated": "^1.8.0",
    "react-native-safe-area-context": "^1.0.0",
    "react-native-screens": "^2.7.0",
    "react-native-web": "~0.11.7"
  },
  "devDependencies": {
    "@babel/core": "^7.8.6",
    "babel-preset-expo": "~8.1.0"
  },
  "private": true
}

Answer 1

改变

import { NavigationNativeContainer } from '@react-navigation/native';

至

import { NavigationContainer } from '@react-navigation/native';


  <NavigationContainer>
  <Stack.Navigator>
  <Stack.Screen name="Home" component={HomeScreen}/>
   </Stack.Navigator>
  </NavigationContainer>

react-navigation 在 beta 的时候是 NavigationNativeContainer，现在是 NavigationContainer

希望这可以帮助！

Answer 2

我有一个对我有用的替代解决方案。 在 Stack.Navigator 中，我将 headerMode 属性设置为“无”。

<HabitStack.Navigator
  headerMode="none"
  initialRouteName="HabitManagerScreen"
>
  <HabitStack.Screen
    name="HabitManagerScreen"
    component={HabitManagerScreen}
  />
  <HabitStack.Screen name="HabitStatsScreen" component={HabitStatsScreen} />
</HabitStack.Navigator>

Answer 3

当您使用本机基础Image组件时，可能会发生此错误：

import {Image} from 'native-base';

<Image source={{uri: 'https://i.pravatar.cc/300?u=1'}} />

改用react-native Image组件：

import {Image} from 'react-native';

<Image source={{uri: 'https://i.pravatar.cc/300?u=1'}} />